Chapter 5 - Hose Nozzles and Flow Rates

The fire service uses 3 types of nozzles to produce 3 basic fire streams: solid, fog, and:

Broken

Generally, handlines will have a flow rate less than:

350 gpm (1400 l/min)

What is the approximate water flow from a 1in (25mm) tip operating at 50 psi (350 kPa)?

L/min = 0.067 x d² x -/NP

210 gpm (783 L/min)

A fire stream from a fog nozzle at its narrowest pattern is known as a ___ stream

Straight

The type of fog nozzle that breaks water into fine, evenly divided droplets by driving several jets of water together are called ___ fog nozzles

Impingement

What type of nozzle flows a specific volume of water on all stream patterns at a specific nozzle discharge pressure?

Constant flow

A type of fog nozzle that has user selected flow rates at its rated nozzle pressure is the:

Selectable gallonage nozzle

On an automatic fog nozzle, when pump pressure is increased above a certain threshold, the nozzle:

Maintains the nozzle pressure and pattern

High-pressure fog nozzles operating up to 800 psi (5600 kPa) work well for fires involving:

Wildland

Master stream nozzles can deliver water flow in excess of:

350 gpm (1400 L/min)

Smooth bore master stream nozzles generally operate with a nozzle pressure of:

80 psi (700 kPa)

Cellar nozzles generally function at a nozzle pressure of:

100 psi (700 kPa)

Rotating head distributor nozzles operate at a nozzle pressure of:

50 psi (350 kPa)

A piercing nozzle with a nozzle pressure of 100 psi (700 kPa) can flow approximately:

125 gpm (500 L/min)

A chimney nozzle supplied by a booster line and operating at a nozzle pressure of 100 psi (700 kPa) will flow up to:

3 gpm (12 L/min)

Solid stream nozzles for handlines operate at a nozzle pressure of:

50 psi (560 kPa)

Determine the solid stream nozzle reaction from a hoseline equipped with a 1.25in (32mm) tip operating at a nozzle pressure of 50 psi (350 kPa)

NR = 0.0015 x d² x NP

120 lbs (540 N)

Find the nozzle reaction of a hoseline with a high-rise fog nozzle 200 gpm (700 L/min) at 100 psi (525 kPa)

NR = 0.022563 x Q x -/NP

100 lbs (362 N)